The Thule Stir 20L is simplicity at its finest Featuring an uncomplicated layout & design the Stir is billed as a lightweight hiking bag but also lends itself as a great day to day bag We ve used ours on walks through the forest all day mountain bike adventures & even trips to the gym a swimming pools The Stir 20L offers one main compartment with access from the top of the bag Rather than using a zippered entry access to the main body of the pack simply requires unhooking a protective storm flap & undoing a drawstring It is the quickest way of accessing the bag & provides excellent weather protection The back panel & shoulder straps are constructed from a lightweight foam with cut-outs removed from extra breathability & even greater weight saving The shoulder straps also houses a sternum strap & a stretchy mesh pocket which will fit an iPhone 6s meaning it is always close by to catch that perfect moment on camera The hipbelt can be tucked away when not required but provides additional support when used for longer hikes Lashing points allow you to carry additional items should you need to whilst the shove it pocket on the front will carry that extra fleece layer Able to carry a reservoir & an additional two bottles thanks to the stretch side pockets the Stir 20L has hydration covered The Stir 20L only weighs 500g making it the perfect companion for any adventure where weight it the absolute priority We have been using a Stir 20L for over a year now & it has become the go to back for all our outdoor adventures